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Creating XPresso Nodes with Python Script

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I am currently writing a script that creates an Xpresso tag on a Cube, and then creates a node, of the Cube, on the Xpresso graph view. I would like to access the Object Properties > Size.Y port. I can get to this point, but whenever I create the Cube node with Size.Y port the node turns yellow. I'm not sure why it does this exactly. When I try to create the setup manually everything works fine. Can anyone here give me some advice? Here is my code.

 

import c4d
def main():
 null = c4d.BaseObject(c4d.Onull)
 doc.InsertObject(null)
 cube = c4d.BaseObject(c4d.Ocube)
 doc.InsertObject(cube,null)
xtag = c4d.BaseTag(c4d.Texpresso)
null.InsertTag(xtag)
 nodemaster = xtag.GetNodeMaster()
print nodemaster.GetOwner().GetName()
node1 = nodemaster.CreateNode(nodemaster.GetRoot(),c4d.ID_OPERATOR_OBJECT,None,100,100)
node1[c4d.GV_OBJECT_OBJECT_ID] = cube
node2 = nodemaster.CreateNode(nodemaster.GetRoot(),c4d.ID_OPERATOR_OBJECT,None,300,100)
node2[c4d.GV_OBJECT_OBJECT_ID] = cube
node1out = node1.AddPort(c4d.GV_PORT_OUTPUT, (c4d.PRIM_CUBE_LEN, c4d.VECTOR_Y))
print node1.GetOperatorContainer()[c4d.GV_OBJECT_OBJECT_ID].GetName()
node2in = node2.AddPort(c4d.GV_PORT_INPUT, (c4d.ID_BASEOBJECT_REL_POSITION, c4d.VECTOR_Y))
 print node2.GetOperatorContainer()[c4d.GV_OBJECT_OBJECT_ID].GetName()
c4d.modules.graphview.RedrawMaster(nodemaster)
 node1out.Connect(node2in)
c4d.EventAdd()
if __name__=='__main__':
 main()

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